GE Vivid S70, User Manual

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Advanced cardiac measurements and analysis
Vivid S70 / S60
–
User Manual
8-25
BC092760-1EN 01
using the Speed slider. In difficult cases, it is also possible to
select the Single layout to get a larger view of the dynamic
mesh.
If the tracking needs to be improved for some segments, the
user can modify the ROI or create a new ROI as described in
‘ROI adjustment’ on
page 8-25
‘
ROI adjustment
If the automatic ROI is not optimal (resulting in poor tracking),
the user can either adjust the ROI or create a new ROI as
described below.
General ROI remarks
The calculations performed on the tracked ROI aim to find the
longitudinal deformation along the cardiac muscle from the base
to apex. These calculations assume the ventricle to have a
horse-shoe shape.
To adjust the ROI
Enter the Define ROI stage. The following adjustments can be
done to the existing ROI:
• Adjust
ROI width
by clicking the ROI Width Control .
• Click and drag on the endocardial part of the ROI.
Endocardial editing edits the whole ROI (Figure 8-14, upper
part).
• Click and drag anchor points on the epicardial ROI
(highlighted in red on mouse hovering). Epicardial editing
edits the epicardial part only (Figure 8-14, lower part).
In the upper right of the screen there is a pictogram indicating
the core features of a good APLAX ROI.
CAUTION
If the ROI does not have a horse shoe shape, the calculated
measurements may not be accurate.